Use a direct include of the message_loop header in chromeos/.

chromeos/dbus/modem_messaging_client_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chromeos/dbus/modem_messaging_client.h"
 
 #include "base/bind.h"
-#include "base/message_loop.h"
+#include "base/message_loop/message_loop.h"
 #include "base/values.h"
 #include "dbus/message.h"
 #include "dbus/mock_bus.h"
 #include "dbus/mock_object_proxy.h"
 #include "dbus/object_path.h"
 #include "dbus/values_util.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"
 
@@ skipping 222 matching lines @@
   // Call List.
   client_->List(kServiceName, dbus::ObjectPath(kObjectPath),
                 base::Bind(&MockListCallback::Run,
                            base::Unretained(&callback)));
 
   // Run the message loop.
   message_loop_.RunUntilIdle();
 }
 
 }  // namespace chromeos